fix(mobile): ChatScreen 加 KeyboardAvoidingView 防 iOS 软键盘盖 Composer

[DeliciousBuding]

背景

移动端 ChatScreen 底部是 Composer（TextInput），iOS 软键盘弹出会盖住输入框，无法看到正在打字的内容/发送态。KeyboardAvoidingView/Platform.OS 在 app/mobile-rn/src 零命中。

变更

• app/mobile-rn/src/screens/ChatScreen.tsx：ChatScreen 主布局从 <View> 改为 <KeyboardAvoidingView behavior={Platform.OS === 'ios' ? 'padding' : undefined}>，iOS 软键盘弹出时 Composer 上移可见；Android 不设 behavior（走原生 windowSoftInputMode）。

证据

• real_tested=false：typecheck + 351 单测全绿；未在真机/模拟器验证键盘交互。
• 本地门禁：corepack pnpm --filter agenthub-mobile-rn typecheck（clean）+ corepack pnpm --filter agenthub-mobile-rn test（351 passed）全绿。

关联

审计 P0-3：mobile 全栈缺 KeyboardAvoidingView。

[coderabbitai]

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